Fluid-control valve



C. H. SMOOT.

FLUID CONTROL VALVE.

APPLICATION man use. 10. 1918.

1,31 1,536. lzltvntvd July 29, I919.

. I 3 nwvvto'c Wdhessea m 5 W a emmn s pics 0 leading UNITED STATES PATENT; OFFICE.

CHARLES E. SHOOT, 0]! SOUTH ORANGE, NEW JERSEY, ASSIGNOB 1'0 THE BA'I'EAU, BATTU, SHOOT ENGINEERING CORPORATION, OF NEW YORK, N. Y., L GOBZPORA- MON OF DELAWARE.

FLUID-CONTROL VALVE.

Specification of Letters Patent.

Patented July 29, 1919.

Application filed December 10, 1918. Sorta-1N0. 266,087.

specification. I

My invention relates. in general to the regulation of pressure or volume of gases automatically as where for example, uniform pressure or volume is to be malntained in a movin body of gas. The general rincisuch an apparatus have alre y been set forth in my prior application filed March 25th, 1918, Serial No," 224,622, and it is in apparatus of the general type therein shown that the present invention constitutes an improvement. The particular improvement contemplated, comprises certain inter-connections betweenthe control valve actuating member and the relief valve which controls the preponderance of fluid pressure to which the control valve actuating member is subjected.

A simple embodiment of one form of the invention comprising the improved feature, will suflice tomake clear to those skilled in the art, the manner in which the improvement may be applied in practice.

The accompanying drawing shows diagrammatically in central vertical section suflicient of the complete system to enable the principles of the invention to be clearly understood.

. In said drawing, E indicates the main or pipe, constituting the passage-way for fluid, the pressure or volumeof which is to be control ed by means of a balanced control valve L, under the influence of pressure responsive valvev actuatin member I, here shown in the form of a 'aphragm.

For applying operatin fluid to the cham ber beneath .di'ap ragm I, a pipe or bypassB may be led efl' for example from the main E, said ipe B communicatin with the chamber eneath diaphragm I and also having a "by-pass passage eading to relief valve T which controls the escape of fluid from t eby-pass into pipe K valve L in, pipe or main E. The admission of fluid into the pipe B is re stricted by adjustable valve D so that a back to the low pressure side of viously, an increase of pressure under diapl ir I tends to close valve L. eig ts H are employed for example to hold the valve L open up to a prescribed pressure within the chamber beneath the diaphragm I. This chamber, I may term the metering chamber, as it contains the parts which actuate the control valve L to derive a measured pressure at theright of valve L in the main E.

In my said prior application, I have shown in principle, the relief valve F for varying the preponderance of pressure in the metering chamber. In the said prior application the relief valve is mechanically free and disconnected from the control valve actuating member, but is ex osed as In the present case, to the lifting e ect of a ressure to which the saidactuatin memer isalso exposed. Furthermore, th in the former invention and in the present invention, a multi lying effect upon the actuation of the re ief valve is obtained by a ressure, derived from the fluid to be reguated, applied to a multiplied area of .surface on a part which controls the position of the relief valve. In the present case, this multiplied surface is seen in the diaphragm G exposed to a pressure corresponding with the low pressure side of valve L in the main E, When this ressure is below normal the relief valve F is more open so that pre ure in the metering chamber being more re ieved, the valve is enedh It will be understood that V vs F is counter-weighted at C to hold it ofl its seat u to a given ressure in the pipe K.

Un or some con iti'ons of pressure variation,-the valve F would vibrate and. cause a corresponding vibration of the main valve actuating mechanism, if mechanically independent ofthe latter. To correct this tendother is prevented by the dash pot action and movement of the two parts in unison is prevented by the opposed eflorts of their actuatin pressures. heir responsive tendencies, w en arran d as shown, are opposite in direction an 'eldingly restrained by the action o f the ash got interconnection. That is to say sudden rop of ressure at the right of va ve L? cannot su denly permit valve F to rise farther off its seat without in the same aitt applying, through the elastic inter-connection, a yielding upward pull on valve L which restrains or retards the response of the latter to the pressure change in the metering chamber. A more gradual and a smoother change in the position of valve F is however, rmitted y the escape of air from the das pot dev1ce J In a re lator of the type herein referred to, a muc improved operation is obtained if the regulating valve opens and closes at a rate or velocity which bears a definite relation to the amount or extent to which the regulated pressure has departed from normal. By means of the dash ot mechanism J the velocity of continu -movement of the regulation valve F in either direction is automatically varied for 'difierent departures of the regulated pressure from normal on the multiplying diaphragm G. A larger departure from normal pressure on diaphragm G produces a more rapid motion of control valve L, which motion is just suflicient to produce from the dash pot J a total force on diaphragm G equal and opposite to the departure from normal of the pressure on G. Small departures from normal value of pressure ondiaphragm G give definitive but slow velocity on control valve L'while larger departures 've more rapid motion to the control valve. fi he dash pot tEerefore directIy meters the relation between velocity of control valve movement and'the extent of departure normal value in the pressure to be regulated.

Momentary departure from normal, thus does not produce substantial] 7 any, variation in the position of the contro valve.

Irclann:

1. A fluid pressure regulator comprisin in combination a control valve for the flui a pressure responsive actuating means therefor, means for admitting a restricted supply of operating fluid to sai between sai actuating means, a

actuating means, a relief valve controlling the escape of operating fluid therefrom to determine the pressure upon said actuating means, means exposed to the pressure to be re lated for controllin the position of said r ief valve, and a yiel ing interconnection between said actuating means and said relief valve to retard the response of the one to the other.

3. A'fluid pressure regulator comprising in combination a. fluid conduit, a control valve therein, a ressure res onsive actuatuid and permitting a measing means there or means or admitting a restricted supply 0 .o eratin fluid to said actuating means, a re ief va ve controlling the escape of operating fluid therefrom to determine the pressure upon said actuating means, means exposed to the pressure to be regulated for controllin the position of said relief valve and a-yiel ing interconnection d actuati means and said relief valve for automatica ly controlling the velocity of response of the control valve to changes of regulated pressure depending on the extent of change.

4. A fluid pressure regulator comprisin in combination a fluid conduit, a centre valve therein, a ressure res onsive actuating means there or means or admitting a restricted supply 0% operatin fluid, to said actuating means, a relief va ve controlling the escape of operating fluid therefrom to determine the pressure upon said actuating means, means exposed to the pressure tobe re ated for controlling the osition of said relief valve, and a dash pot interconnecting said relief valve and the control valve actuating means, to render response of the latter dependent in velocity upon the extent, of change in the regulated pressure. 

